Improvement in steam generatoes



@nimh gieten tent @frn IMPROVEMENT IN STEAM GENERATORS.

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TO ALL WHOM I'l lv'AY CONCERN:

Be it known that I, WILLIAM BRANAGAN, of Burlington, in the county of Des Moines, and State of Iowa, have invented an Improvement in Upright Steam Boilers; andI do hereby declare that the following isa full, clear, and exact description thereof, reference being had to the accompanying drawing, making a partof this specification, in whichi Figure l is a front elevation of theboiler.

" Figure 2 is adiametrical section through the same.

Figure 3 is a section taken in the horizontal plane indicated by red line :z: z, tig. 1.

4Figure 4 is a section taken in the horizontal plane indicated by red line y y, g. 2.

Similar letters of reference indicate corresponding parts in the severalgures.

Themain object of this invention and improvement in the construction of upright steam boilers is to obtain economy in fuel and space, by conducting the heated products of combustion from the hre-chamber directly through the horizontal transverse lines which pass through the water space and into a jacket which surrounds the'boiler, and is capable of being revolved, so that both the inside Walls, whichform said Water space, tvill be,

subjected to the direct action of heat, as will be hereinafter described.

To enable others skilled in the art to understand my invention, I will describe its construction and operation.

In the accompanying drawings, A represents the'onter wall of the boiler, which is an upright cylinder, terminating at its upper end in a dome, as shown in iig. 2; and B represents the inner wall-of the boiler, which corresponds in shape to the Wall or shell A, but which vis somewhat smaller than this Wall, so as to leave the water space a and steam spacevb. These two shells, A B, are suitably united together at their lower en'ds,and stayed at their upper ends, so as to possess great strength. The lire-chamber lills the entire space enclosed by the inner shell B, and the heated products of combustion rising in this chamber, pass on' through a great number of small tubes, c c, which extendthrough the water space a, as shown in figs. 23, and 4. These short tubes, c, unite the two upright shells o? the boiler, and completely surround the same, each tube radiating from the axis of the-boiler. These tubes e may extend from a point which is directly above theiire-doorE to the termination of the cylindrical portions of the shells,'so that there will be free draught and free escape of the products of combustion from the lire-chamberl Surrounding that portion of the boiler which is thus provided with lues or tubes, c, is a cylindrical jacket, D, which forms a space, g, into which the heat and gases, escaping from the lire-chamber through lines e, enter. rlhis cylindrical jacket, D, is closed at its upper and lower ends, and so applied to the outer shell of the boiler, that it can be revolved around the same. Jacket D is provided with one orlmore openingsV through it, which are clqosed by the doors la; and it is also provided with branch-pipes, G G, leading from it and communicating at their upper ends with the main smoke pipe G'r, which latter is arranged directly over the boiler, and in a vertical line, coinciding with its axis. The jacket D, with its attachments, is jmaclc to -revolve around the boiler, when it is desired toA have access to the lues for cleaning them; i If the jacket D was rigidly attached to the outer shell of the boiler, then access could be. had only to those ilues, c, which are directly opposite the opening or openings through the jacket. By allowing' this jacket to revolve, as above stated, the opening through it can be-moved' opposite all of the lues e,and they can be readily cleaned and kept free from cinders. The jacketD not only serves as a means forv applying the heat oi.l the esca-ping products ofcombustion to'the outer Wall or shell A of the boiler, and thus having the water space a heated on both sides, but it also serves the important purpose' of preventing cold currents of air from impinging upon the outer shell which it surrounds. This jacket thus 4serves as a, heat retainer as wellas a means for utilizing the escaping Aheated gases. Y

Having thus described my invention, what I claim as new, and desire to vsecure by Letters Patent, is-

Applying a jacket, D, to a boiler, which is constructed 4substantially as described, so that this jacket can revolve around the boiler, substantially as specified.

' i WILLIAM BRANAGAN. Witnesses:

CnAs. Sewon-cs,

WM. J. PoLLocK. 

